Poration



July 14, 1925.

ggf.

' core to form the side langes and Reissued July` 14, 1925.

f UNITED STATES JULIUS H. SC'HLAFLY, OF CANTO'N, OHIO,

ASSIGNOB TO UNITED ALLOY STEEL COR- PORATION, OF CANTON, OHIO, `ACORPORATION OF NEWYORK.

origini No. 1,434,068, dated To allwhom it 001mm:

Be it known that 1,. J ULIUs SCHLAFLY, a citizen of the United States,residing at Canton, in the county of Stark and State of Ohio, haveinvented a certain new and `useful Improved Method of Making CorrugatedCores, of which the following is a specication. l 2

vThe invention relates te the manufacture of transversel -corrugatedsheet-metal cores `for concrete oor-construction; and the object oftheimprovement is to form the cores with deepencorrugation than canbemade byvordiinary methods, so as to increase the supporting Strengthofthe cores.

A common method of making such cores is by a pressing or stampingvoperation to form the transverse corru ations at the same time the coreis sha from a plain sheet of metal, andas the length of the sheet isnecessarily shortened by the formation of the corrugations ofthe core,the depth to which the oorrugations can be formed .-is limited and 'thesupporting strength of the core is likewise limited.

The improved method involves an initial corrugation of a plain sheet soas to accumulate or gather the metal and shorten the sheet to or aboutthe length of the finished core, a subsequent shaping of the partiallyformfthe arch angles while forming deep corrugations from the gatheredmetal, followed by a nal shaping ofthe arch angles.

The initial'corrugations can be made in any form or of any dimensionswhich will accumulate suiiicient metal to permit the formation of thedesireddeep corrugations Without any considerable stretching of themetal be ond the necessary tension which is desira le tov take up allthe kii-.nks and bends there may be in the ordinary sheet;

and the iinal corrugation of the ianges may correspond to thecorrugations in the body of the core, ormay be reversed at the angle ofthe flange in Well known manner s as to increase the strength of theflanges; and

' both arch angles may be finally shaped by a single operation or byseparate operations as may be desired.

The accompanying drawings forming a part hereof illustrate various stepswhich nm'rngn orV MAKING coanUGATED comas.

october 31,- 1922, serial No. 538,783, inea February 2s, 1922.Application for reissue led June 23, 1923. Serial No. 647,366.

may be employed in carryin out the improved method,l in which dlwings-Figure 1 is a plan of a `plain sheet; Fig. 2, a plan of the same after`it has been initially corrugated;

Fi 3, an enlarged longitudinal section of t e initially corrugated sheeton line III-III, -Iignw, showing aglike section of deepcorrugating'.dies;l

lFig. 4, a. transverse section of deep corrugat-ing and partial shapingdies, showing N the sheet therein with lthe flange angles formed and thearch angles partly formed;

Fig. 5, a perspective section of one-half of the lower deep corrugatingVand partial shaping die,. with half a core shaped therein;

Fig. 6, a transverse sectionof dies which may be used for finallyshaping both arch angles by a single operation;

Fig. 7, a transverse section of dies which may be used for nallyseparately shaping thed arch angles by successivel operations; an

Fig 8, a perspective view of the completed core,H with reverselycorrugated flanges.- i

Similar numerals refer to similar parts throughout the several iiguresof the drawings. y

A plain sheet 9 is initially formed with transverse corrugations by anywell known' rolling, pressing, or stamping operation, so as toaccumulate or gather the material uniformly throughout the sheet andreduce its length to substantially the length of the finished core. y 1

The corrugations may ordinarily be made without much', if any,stretching of the metal, Ibut. for very deep corrugations, the metal canbe stretched to or near its elastic limit; and the character of thecorrugations may vary from the middle to the ends of th'e sheet, tocompensate for the action of the dies in4 the succeeding steps of theprocess. y

The shortened sheet 10 may have rounded corrugations 11 of about halfthe depth and width of the deep corrugations 12 to be nally formed, soas to accumulate the necessary metal required for the deep corrugations;but the particular shape and throughout the length of the sheet, andtheA corrugations of the side flanges 15 may conform to the corrugationsin the body of the core; but the flange corrugations 17, are

preferably reversed at the angle of the ange to avoid a straining orrupture of the metal at this point, and to increase the strength of theange angle.

The partiall formed longitudinal arch angles 16 may lie fully formed,both at the same time by a single operation, by complementary dies 18and 18', as shown in Fig.

' 6; or may be finally formed separately, by

complementary dies 19 and 19', as shown 1n Fig. 7 thereby completing theformation of ghe core With deep corrugations as shown in It is evidentthat the described method of corrugating and shaping a sheet may beemployed for making an arched core without any side flanges; and alsothat the same method of corrugating a sheet may be employed Withoutshaping the same to make an arched core.

And it will be understood that the ldeeper contiguous corrugations maybe formed from the accumulated metal, substantially without anystretching or compression of the metal or any further contraction of theinitially corrugated sheet'.

I claim:

1. The method of making transverselycorrugated sheet-metal cores for'concrete door construction and the like, which consists in transverselycorrugating a sheet to accumulate the metal uniformly throughout itslength, then forming a continuous series of deeper corrugations from theaccumulated metal and shaping the sheet to form flarges along the sidesand an intermediate arc 1.

2. The method of making transverselycorrugated sheet-metal cores' forconcrete oor construction and the like, which consists in transverselycorrugating a sheet to accumulate the metal uniformly throughout itslength, then forming a continuous series of deeper corrugations from theaccumu-` lated metal and contemporaneously shaping the sheet to formflanges along the sides and an intermediate arch.

3. The method of making transverselycorrugated sheet-metal cores forconcrete floor construction and the like, which consists in transverselycorrugating a sheet to accumulate the metal uniformly throughout itslength, then forming a continuous series of deeper corrugations from theaccumulated metal and shaping the sheet to form reversely corrugatedflanges along the sides and an intermediate arch.

4. The method of making transverselylcorrugated sheet-metal cores forconcrete floor construction and the like, which consists in transverselycorrugating a sheet to accumulate the metal uniformly throughout itslength then forming a continuous series of deeper corrugations from theaccumulated metal and shaping the sheet to fully form flange anglesalong the sides' and to partly form intermediate arch angles, and thenfully forming the intermediate arch angles.

5. The method of making transversely corrugated sheet-metal cores forconcrete floor construction and the like, which consists in transverselycorrugating a sheet to accumulate the metal throughout its length, thenforming a continuous series of deeper corrugations from the accumulatedmetal and shaping the sheet to form flanges along the sides and anintermediate arch.

6. vThe method of making transverselycorrugated sheet-metal cores forconcrete construction and the like, which consists in transverselycorrugatin a sheet to accumulate the metal throug out its length, thenforming a continuous series of deeper corrugations from vthe accumulatedmetal and shaping the sheet to form an arch inter- 1 mediate the sidesthereof.

7. The method of making transverselycorrugated sheet metal cores forconcrete construction and the like, which consists in transverselycorrugating a sheet to accumulate the metal uniformly throughout itslength, then forming a continuous series of deeper corrugations from theaccumulated metal and shaping the sheet to form an arch intermediate thesides thereof.

8. The method of making transverselycorrugated sheet-metal cores forconcretel construction and the like, ,which consists in transverselycorrugating a sheet to accumulate the metal uniformly throughout itslength, and then forming a continuous series ofdeeper corrugations fromthe accumulated metal and contemporaneously shaping the sheet to form anarch intermediate the sides thereof.

9. The method of making transverselycorrugated sheet-metal cores forconcrete construction and the like, which consists in transverselycorrugating a sheet to accumulate the metal uniformly throughout itslength, then forming a continuous series of 1 deeper corrugations fromthe accumulated metal and shaping the sheet to partly form arch anglesintermediate the sides thereof, and then fully forming the arch angles.

10. The method lof corrugating a sheet of metal, which consists incorrugating the sheet to accumulate `the metal uniformlyy throughout itsextent, and then forming a continuous series of deeper contiguouscorrugations from the accumulated metal without an substantialstretching or' compression o the metal or further contraction of theinitially corrugated sheet.

11. The method of corrugating a sheet of metal, which consists 2incorrugating the sheet to accumulate the metal through its extent, andthen forming a continuous series of deeper contiguous corrugations fromthe accumulated metal wit-hout any substantial stretching or compressionof the metal or i further contraction of the initially corrugated sheet.

12. The method of corrugating a sheet of metal, which consists incorrugating the sheet to accumulate' the metal uniformly throughout itsextent, and then reversely corrugating alternate corrugations to form acontinuous series of deeper corrugations from the accumulated metal.

13. The method of corrugating a sheet of ymetal, which consists incorrugating the sheet to accumulate the metal throughout its extent, andthen reversely corrugating alternateJ corrugations to form a continuousseries of deeper corrugations from the accumulated metal.

J ULIUS H. SCHLAFLY.

